src/chrome/browser/extensions/api/hid/hid_device_manager.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef CHROME_BROWSER_EXTENSIONS_API_HID_HID_DEVICE_MANAGER_H_
   6 #define CHROME_BROWSER_EXTENSIONS_API_HID_HID_DEVICE_MANAGER_H_
   7
   8 #include <stdint.h>
   9
  10 #include <map>
  11
  12 #include "base/basictypes.h"
  13 #include "base/memory/scoped_ptr.h"
  14 #include "base/threading/thread_checker.h"
  15 #include "chrome/browser/profiles/profile.h"
  16 #include "chrome/common/extensions/api/hid.h"
  17 #include "device/hid/hid_device_info.h"
  18 #include "extensions/browser/browser_context_keyed_api_factory.h"
  19
  20 namespace extensions {
  21
  22 class HidDeviceManager : public BrowserContextKeyedAPI {
  23  public:
  24   explicit HidDeviceManager(content::BrowserContext* context);
  25   virtual ~HidDeviceManager();
  26
  27   // BrowserContextKeyedAPI implementation.
  28   static BrowserContextKeyedAPIFactory<HidDeviceManager>* GetFactoryInstance();
  29
  30   // Convenience method to get the HidDeviceManager for a profile.
  31   static HidDeviceManager* Get(content::BrowserContext* context) {
  32     return BrowserContextKeyedAPIFactory<HidDeviceManager>::Get(context);
  33   }
  34
  35   scoped_ptr<base::ListValue> GetApiDevices(uint16_t vendor_id,
  36                                             uint16_t product_id);
  37
  38   bool GetDeviceInfo(int resource_id, device::HidDeviceInfo* device_info);
  39
  40  private:
  41   friend class BrowserContextKeyedAPIFactory<HidDeviceManager>;
  42
  43   static const char* service_name() { return "HidDeviceManager"; }
  44
  45   void UpdateDevices();
  46
  47   // Determines if a given device interface should be accessible to API
  48   // consumers. In order for a device interface to be accessible, ALL of its
  49   // specified usages must be accessible.
  50   static bool IsDeviceAccessible(const device::HidDeviceInfo& device_info);
  51
  52   // Determines if a given usage is available to API consumers. This is used to
  53   // blacklist usages which could be security or privacy concerns.
  54   static bool IsUsageAccessible(const device::HidUsageAndPage& usage_and_page);
  55
  56   base::ThreadChecker thread_checker_;
  57
  58   int next_resource_id_;
  59
  60   typedef std::map<int, device::HidDeviceId> ResourceIdToDeviceIdMap;
  61   typedef std::map<device::HidDeviceId, int> DeviceIdToResourceIdMap;
  62
  63   ResourceIdToDeviceIdMap device_ids_;
  64   DeviceIdToResourceIdMap resource_ids_;
  65
  66   DISALLOW_COPY_AND_ASSIGN(HidDeviceManager);
  67 };
  68
  69 }  // namespace extensions
  70
  71 #endif  // CHROME_BROWSER_EXTENSIONS_API_HID_HID_DEVICE_MANAGER_H_